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Weather & Climate in Aioi, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Aioi enjoys a temperate climate with an average annual temperature of 58°F (15°C). Winters average 39°F in January while summers reach 78°F in July. The area gets 235 sunny days per year, above the national average. Annual precipitation totals 55.4 inches (wetter than the 38-inch national average). The city sits at an elevation of 26 feet.
Temperature
39°F Jan (4°C)
78°F Jul (26°C)
| Annual Average | 58.2°F |
| 8% above US avg | |
| January Average | 39°F (4°C) |
| July Average | 78°F (26°C) |
| Sunny Days | 235 days/yr |
Geography
| Elevation | 26 ft (8 m) |
| Area | 34.9 sq mi (90.4 km²) |
| Population Density | 812/sq mi |
| Coordinates | 34.8036°N, 134.4681°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
255 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.9.
| Jan 16, 1995 | 8 km S of Akashi, Japan | M6.9 | 56 km | 22 km |
| Oct 6, 2000 | 8 km ESE of Matsue, Japan | M6.7 | 141 km | 10 km |
| Apr 11, 1990 | 11 km ENE of Maizuru, Japan | M6.1 | 116 km | 362 km |
| Aug 7, 1992 | 21 km N of Miyazu, Japan | M5.8 | 120 km | 358 km |
| Apr 12, 2013 | 6 km WNW of Sumoto, Japan | M5.8 | 59 km | 14 km |
| Aug 20, 1999 | 22 km SE of Kainan, Japan | M5.7 | 122 km | 66 km |
| Apr 21, 2000 | 27 km NNE of Maizuru, Japan | M5.5 | 133 km | 347 km |
| Jun 17, 2018 | near the south coast of western Honshu, Japan | M5.5 | 107 km | 10 km |
| Aug 28, 1991 | 9 km SSW of Yasugich?, Japan | M5.5 | 129 km | 13 km |
| Sep 24, 2003 | 5 km WNW of Ayabe, Japan | M5.4 | 87 km | 372 km |
| Oct 8, 2000 | 32 km N of Sh?bara, Japan | M5.4 | 136 km | 10 km |
| Sep 3, 1997 | 21 km S of Yasugich?, Japan | M5.3 | 123 km | 10 km |
| Sep 16, 2002 | 24 km SW of Kurayoshi, Japan | M5.3 | 90 km | 10 km |
| Jan 11, 2001 | 15 km E of Tottori, Japan | M5.3 | 75 km | 33 km |
| Oct 8, 2000 | 8 km SSW of Yonago, Japan | M5.2 | 122 km | 10 km |
| Mar 13, 2019 | 22 km ESE of Anan, Japan | M5.2 | 116 km | 37 km |
| Apr 14, 2000 | 10 km SSW of Tanabe, Japan | M5.1 | 149 km | 35 km |
| Apr 26, 2007 | 15 km ESE of Niihama, Japan | M5.1 | 137 km | 50 km |
| Mar 16, 1999 | 10 km WNW of Kitahama, Japan | M5.1 | 131 km | 33 km |
| Jan 16, 1995 | 20 km SW of Akashi, Japan | M5.0 | 44 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
45 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2023 | Lan | Category 2 | 75 mph | 167 km |
| 2018 | Jebi | Category 3 | 98 mph | 69 km |
| 2018 | Trami | Category 1 | 92 mph | 146 km |
| 2018 | Cimaron | Category 1 | 86 mph | 31 km |
| 2018 | Jongdari | Category 1 | 75 mph | 243 km |
| 2017 | Lan | Category 1 | 98 mph | 296 km |
| 2017 | Noru | Category 1 | 69 mph | 107 km |
| 2016 | Malakas | Category 1 | 86 mph | 240 km |
| 2015 | Nangka | Category 1 | 81 mph | 201 km |
| 2014 | Phanfone | Category 2 | 92 mph | 218 km |
| 2014 | Halong | Category 1 | 81 mph | 228 km |
| 2012 | Jelawat | Category 1 | 92 mph | 248 km |
| 2011 | Roke | Category 3 | 98 mph | 237 km |
| 2011 | Ma-on | Category 1 | 86 mph | 134 km |
| 2009 | Melor | Category 1 | 86 mph | 215 km |
| 2008 | Sinlaku | Category 1 | 75 mph | 226 km |
| 2007 | Usagi | Category 2 | 92 mph | 247 km |
| 2007 | Man-yi | Category 1 | 81 mph | 280 km |
| 2005 | Nabi | Category 1 | 75 mph | 291 km |
| 2004 | Songda | Category 2 | 86 mph | 214 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tsunami History
9 tsunamis recorded within 500 km. Highest wave on record: 11.3 m (37 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1927 | SW. HONSHU ISLAND | Eruption + Earthquake | 11.3 m | 3,022 | 106 km |
| 1711 | SEIONAIKAI, JAPAN | Earthquake | 2.0 m | 1,000 | 71 km |
| 1510 | OSAKA BAY | Earthquake | 2.0 m | - | 88 km |
| 1808 | E. AWA, TOKUSHIMA PREFECTURE | Earthquake | 1.5 m | - | 105 km |
| 1995 | KOBE, JAPAN | Earthquake | 0.3 m | 6,434 | 60 km |
| 1791 | OASAKA BAY | Earthquake | - | - | 92 km |
| 1331 | OFF TANABE, WAKAYAMA PREFECTURE | Earthquake | - | - | 140 km |
| 745 | OSAKA BAY, JAPAN | Earthquake | - | - | 79 km |
| 701 | SEA OF JAPAN | Earthquake | - | - | 131 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
2 volcanoes within 200 km. Closest: Sanbesan (172 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Sanbesan | Stratovolcano | 1,126 m (3,694 ft) | 650 | 172 km |
| Oki-Dogo | Shield | 151 m (495 ft) | Unknown | 184 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 39°F (4°C) | 1.8 in | Coldest |
| February | 39°F (4°C) | 2.3 in | |
| March | 44°F (7°C) | 3.6 in | |
| April | 55°F (13°C) | 5.3 in | |
| May | 63°F (17°C) | 5.6 in | |
| June | 70°F (21°C) | 8.3 in | |
| July | 78°F (26°C) | 7.2 in | |
| August | 80°F (27°C) | 4.3 in | Warmest |
| September | 73°F (23°C) | 8.5 in | Wettest |
| October | 62°F (17°C) | 4.3 in | |
| November | 52°F (11°C) | 2.8 in | |
| December | 43°F (6°C) | 1.4 in | Driest |
Aioi has a seasonal temperature swing of 41°F / from 39°F in January to 80°F in August. Total annual precipitation is 55.4 inches, with September being the wettest month (8.5") and December the driest (1.4").